Naturalista sicil., S. IV, XXVIII (3-4), 2004, pp SEED DISPERSAL OF CAPPARIS SPINOSA L. (Capparaceae) BY MEDITERRANEAN LIZARDS
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1 Naturalista sicil., S. IV, XXVIII (3-4), 2004, pp SILVIO FICI & FABIO LO VALVO SEED DISPERSAL OF CAPPARIS SPINOSA L. (Capparaceae) BY MEDITERRANEAN LIZARDS SUMMARY Mediterranean lizards are involved in the dispersion of Capparis spinosa subsp. rupestris due to their attraction by fleshy tissues of the fruits, ripening in xeric coastal environments during the summer months. The results of field observations carried out in Linosa (Pelagie Islands) are presented, showing that dispersal by Podarcis filfolensis laurentiimuelleri principally happens through ingestion of the seeds together with parts of the fleshy pulp. This lizard, endemic to Linosa and Lampione is widespread in different habitats and shows trophic generalism. The fruit of C. spinosa subsp. rupestris, a dehiscent berry, is described and the implications of the dispersal agents on the autecology of this plant are discussed. These observations confirm the importance of lizard-plant mutualism in the islands, where lizards are often recorded as fruit consumers. RIASSUNTO Dispersione dei semi di Capparis spinosa L. (Capparaceae) nel Mediterraneo per mezzo di lucertole. Le lucertole sono coinvolte nella dispersione di Capparis spinosa subsp. rupestris grazie all attrazione esercitata dalle parti carnose dei frutti, che maturano nelle zone costiere del Mediterraneo durante i mesi estivi. Indagini condotte nell isola di Linosa hanno permesso di osservare come Podarcis filfolensis laurentiimuelleri nutrendosi di parti della polpa carnosa ingerisca semi causandone la dispersione. Questa lucertola, endemica di Linosa e Lampione, è caratterizzata da generalismo trofico. Viene descritto il frutto di C. spinosa subsp. rupestris, una bacca deiscente, e vengono discusse le implicazioni di questa forma di saurocoria riguardo alla distribuzione della pianta. Le presenti osservazioni confermano l interesse delle relazioni tra lucertole e piante, con particolare riferimento agli ecosistemi insulari.
2 1148 S. FICI & F. LO VALVO INTRODUCTION Lizard-plant interactions have been traditionally undervalued, but in the last decade interest in the ecology of these animals has increased and studies from widely disparate regions confirmed their role as pollinators and seed dispersers (OLESEN & VALIDO, 2003). It is remarkable that ancient groups of lizards have been recognized as important seed dispersers of the first angiosperms (TIFFNEY, 1984). BORZÌ (1911) firstly examined the role of lacertid lizards as dispersers of some higher plants, also describing different types of fruits consumed by them. Notwithstanding this, lizards of this group are usually not regarded as mutualistic agents, possibly because most are considered as carnivorous, but many of them have a broad diet, including flowers, fruits, nectar and pollen (COOPER & VITT, 2002). Lizards show a streptostylic mandibular suspension which precludes the use of mandibles for chewing, and they can eat only soft vegetal tissues (OSTROM, 1963; SZARSKI, 1962). Lacertid lizards are oligophagous herbivores, recognizing a limited variety of plants and eating their fiber-poor components (PÉREZ MELLADO & TRAVESET, 1999). Actually only few lizard species are recognized as strictly herbivorous, many others eating plant material in variable proportions and preferring flowers and fruits presumably because these parts are more easily assimilated than vegetative organs (SÁEZ & TRAVESET, 1995). Even if frugivory has been observed in continental populations (HERNÁNDEZ 1990; TRAVESET 1990) literature data show that dispersal by lizards is most common in the islands, e.g. sixty-eight percent of fruit eating lizards are known from island populations (OLESEN & VALIDO, 2003). This phenomenon has been explained in terms of density compensation, diet expansion and low predation levels. However PÉREZ MELLADO & TRAVESET (1999), studying two species of lizards endemic to the Balearic Islands, stated that plant consumption cannot be considered true trophic specialization; indeed these lizards show helminth infracommunities in the digestive tracts typical of insectivorous lizards (ROCA & HORNERO, 1994). Even if the coevolution between plants and animals has been stressed, much attention should be paid to the influence of the different dispersal agents on the distribution and autecology of the single species of plants. Furthermore the study of seed dispersal by reptiles has received little attention if compared to seed dispersal by birds and mammals (HOWE & WESTLEY, 1988; JORDANO, 1992). In this paper we report our observations on fruit feeding and seed dispersal of the caper bush Capparis spinosa L. subsp. rupestris (Sm.) Nyman in Linosa (Pelagie Islands) by a lacertid lizard, Podarcis filfolensis (Bedriaga, 1876). In Italy this lizard is represented by subsp. laurentiimuelleri (Fejérváry, 1924), endemic to Linosa and Lampione. Despite the high number of indi-
3 Seed dispersal of Capparis spinosa L. (Capparaceae) viduals it should be regarded as vulnerable (CORTI et al., 1997), due to its distribution on only two small islands. In Linosa this lizard is widespread in several habitats, with higher density in the inland areas occupied by maquis (DI PALMA, 1991). The references on its diet showed a broad generalism, with high percentage of Coleoptera, ants and plant material in the stomach contents (SORCI, 1990). The Steno-Mediterranean C. spinosa subsp. rupestris is a shrub with spreading-pendulous branches, widespread in Sicily and surrounding islands on carbonatic and volcanic outcrops and old walls (FICI & GIANGUZZI, 1997; FICI, 2001). For this taxon BORZÌ (1911) recorded lizards, wasps and probably birds as seed dispersers, while recently LI VIGNI & MELATI (1999) underlined that the smell and the pulp of the ripe fruit attract lizards, wasps and ants. In northern Sicily seeds of C. spinosa were found in the stomach contents of woodpigeons (MASSA, com. verb.). Regarding lizards, fruit consumption by Podarcis melisellensis is recorded in TIEDEMANN & HENLE (1986), while PÉREZ-MELLADO & TRAVESET (1999) observed Podarcis lilfordi eating fruits of this plant in the Cabrera archipelago, but dubiously regarded this lizard as a seed disperser of C. spinosa. The volcanic Linosa island has been selected for our observations due to the high density of the easily observable P. filfolensis laurentiimuelleri, and to the presence of wild populations of C. spinosa subsp. rupestris. MATERIAL AND METHODS Our data are based upon direct observations of foraging lizards, made during the peak of their daily activity period, in spring-summer 2002 and We followed individual lizards in proximity of fruiting plants of C. spinosa subsp. rupestris, from a distance of 2-3 m, during 20 minutes or until the animals disappeared. At different times of the day fruits were also placed near the burrows of the lizards, and foraging was observed. At the same time observations on the autecology, phenology and fruit characters of C. spinosa were carried out. Some additional observations were made examining fecal samples taken from the ground. RESULTS AND DISCUSSION C. spinosa subsp. rupestris is widespread in Linosa on rocky outcrops, cliffs and old walls (Fig. 1). In the same island it is also propagated by man and planted along roadsides and slopes. Production of flower buds starts in April, prolonging to the autumn. The flower buds are traditionally collected
4 1150 S. FICI & F. LO VALVO Fig. 1 Natural habitat of Capparis spinosa subsp. rupestris in Linosa. to obtain the commercial capers. The fruit is an oblong-ellipsoid berry c. 3,2-5 (-7) cm long, green when young, then reddish-violaceous and splitting along one or more ribs (Fig. 2). The seeds, c. 2-4 mm, are embedded in a pulp badsmelling after dehiscence. BORZÌ (1911) underlined that the fruits of the caper bush, when ripe, lay on the rocks due to their weight and to the weak peduncle, thus they are easily reached by creeping animals. P. filfolensis was observed in Linosa climbing on the branches of the plants to reach the dehiscent fruits (Fig. 3), or feeding on fruits laying on the rocks and walls. Several individuals were counted simultaneously on a single plant. Lizards are mostly attracted by ripe fruits (Fig. 4), probably due to their smell, but they also feed on fruits with dried pulp, several days after dehiscence. The fruits placed near the burrows rapidly attracted the lizards, which feeding on the pulp occasionally ingested the seeds. Based on the examination of the lizard scats, seeds remained intact after passing through the intestines. Furthermore in some cases body contact of the lizard with the fruit caused an accidental adherence of the pulp to the skin. Hence, an occasional external transport of
5 Seed dispersal of Capparis spinosa L. (Capparaceae) Fig. 2 Ripe fruit of Capparis spinosa subsp. rupestris. the seeds by lizards should be hypothesized. The berries of C. spinosa subsp. rupestris mostly ripe during the dry summer months, when few other fleshy fruits are available. In the same period lizards were frequently observed in the island feeding on the fruits of naturalized or cultivated species, as the Barbary fig (Opuntia ficus-indica) and tomato (Lycopersicon esculentum). PÉREZ-MEL- LADO & TRAVESET (1999) listed some species in the Cabrera archipelago producing fruits consumed by lizards; some of these are represented in the flora of Linosa (BRULLO & SIRACUSA, 1995), i.e. Ficus carica, Chenopodium murale, Pistacia lentiscus, Daucus gingidium, Phillyrea latifolia, Asparagus stipularis. In the island lizards are also attracted by remains of different kind of food. SÁEZ & TRAVESET (1995) stated that herbivory of lizards varies with season, underlining a noteworthy reduction in percentage of plant material in the stomach contents from winter to summer. Our observations show that in Linosa the fruits of C. spinosa subsp. rupestris and other plants appear to represent an important resource for lizards during the dry season. Based on our observations the habitat of C. spinosa subsp. rupestris in
6 1152 S. FICI & F. LO VALVO Fig. 3 Podarcis filfolensis laurentiimuelleri climbing on the branches of Capparis spinosa subsp. rupestris. Linosa is strictly linked with the transport of seeds by P. filfolensis laurentiimuelleri, a lizard spending most time on walls and rocks. In Northern Sicily GIANGUZZI et al. (1993) recorded C. spinosa subsp. rupestris as dominant of a chasmo-nitrophilous association described as Capparidetum rupestris O. Bolòs et Molinier 1958 widespread at the basis of cliffs and on old walls. Here C. spinosa subsp. rupestris shows high cover values in communities including few other species, as Parietaria diffusa, Hyosciamus albus, Umbilicus rupestris, Antirrhinum siculum, etc. It is to be underlined that it becomes rare or absent within strictly specialized communities of the cliffs at higher altitudes, probably in relation to the habits of the dispersers. The dispersal of C. spinosa subsp. rupestris by lizards in the investigated site appears to be linked with their trophic generalism and adaptations in the diet during the summer. According to IVERSON (1985) lizards are potentially important seed dispersers for several plant species, particularly in the islands, where they are usually the dominant group of land herbivores. Since C. spinosa shows a
7 Seed dispersal of Capparis spinosa L. (Capparaceae) Fig. 4 Podarcis filfolensis laurentiimuelleri feeding on ripe fruit. largely disjunct distribution, being represented by several intraspecific taxa in Africa, Asia, Australia and Oceania, further observations in these areas should add new data on the dispersal agents of this ancient paleotropical and subtropical group. Acknowledgements. We are grateful to P. Lo Cascio for comments on the manuscript, and to G. Di Pasquale and family Gravagna for helpful advice during field observations. This research was supported by MIUR (ex 60%) and Regione Sicilia (L.R. n. 25/93). REFERENCES BORZÌ A., 1911 Ricerche sulla disseminazione delle piante per mezzo di sauri. Mem. Soc. Ital. Sc., ser. 3, 17: BRULLO S. & SIRACUSA G., 1995 La flora dell Isola di Linosa (Arcipelago delle Pelagie, Sicilia). Boll. Acc. Gioenia Sci. Nat., 28: COOPER W. E. & VITT L. J., 2002 Distribution, extent, and evolution of plant consumption by lizards. J. Zool., 257:
8 1154 S. FICI & F. LO VALVO CORTI C., LO CASCIO P., VANNI S., TURRISI G. F. & VACCARO A., 1997 Amphibians and reptiles of the circumsicilian islands: new data and some considerations. Boll. Mus. reg. Sci. Nat. Torino, 15 (1): DI PALMA M. G., 1991 Censimento della popolazione di lucertole dell isola di Linosa (Agrigento). Suppl. Ric. Biol. Selvaggina, 16: FICI S., 2001 Intraspecific variation and evolutionary trends in Capparis spinosa L. (Capparaceae). Plant Syst. Evol., 228: FICI S. & GIANGUZZI L., 1997 Diversity and conservation in wild and cultivated Capparis in Sicily. Bocconea, 7: GIANGUZZI L., ILARDI V. & RAIMONDO F. M., 1993 La vegetazione del promontorio di Monte Pellegrino (Palermo). Quad. Bot. Amb. Appl., 4: HERNÁNDEZ A., 1990 Observaciones sobre el papel del lagarto ocelado (Lacerta lepida Daudin), el erizo (Rinaceus europaeus L.) y el tejón (Meles meles L.) en la dispersión de semillas. Doñana Acta Vert., 17: HOWE H. F. & WESTLEY L. C., 1988 Ecological relationships of plants and animals. Oxford University Press. New York, Oxford. IVERSON J. B., 1985 Lizards as seed dispersers? J. Herpetol., 19: JORDANO P., 1992 Fruits and Frugivory. Pp in: FENNER M. (ed.), Seeds. The ecology of regeneration in plant communities. CAB International. Wallingford, UK. LI VIGNI I. & MELATI M. R., 1999 Examples of seed dispersal by entomochory. Acta Bot. Gallica, 146 (2): OLESEN J. M. & VALIDO A., 2003 Lizards as pollinators and seed dispersers: an island phenomenon. Tr. Ecol. Evol., 18 (4): OSTROM J. H., 1963 Further comments on herbivorous lizards Evolution, 17: PÉREZ-MELLADO V. & TRAVESET A., 1999 Relationships between plants and mediterranean lizards. Nat. Croat., 8 (3): ROCA V. & HORNERO M. J., 1994 Helminth infracommunities of Podarcis pityusensis and Podarcis lilfordi (Sauria: Lacertidae) from the Balearic Islands (western Mediterranean basin). Can. J. Zool., 72 (4): SÁEZ E. & TRAVESET A., 1995 Fruit and Nectar Feeding by Podarcis lilfordi (Lacertidae) on Cabrera Archipelago (Balearic Islands). Herpetol. Rev., 26 (3): SORCI G., 1990 Nicchia trofica di quattro specie di Lacertidae in Sicilia. Naturalista sicil., s. 4, 14 (suppl.): SZARSKI H., 1962 Some remarks on herbivorous lizards Evolution, 16: 529. TIEDEMANN F. & HENLE K., 1986 Podarcis melisellensis (Braun, 1877) Adriatische Mauereidechse, Karstläufer. Pp in: BÖHME W. (ed.), Handbuch der Reptilien und Amphibien Europas, Vol. 2/II, Echsen III. Aula-Verlag, Wiesbaden. TIFFNEY B. H., 1984 Seed size, dispersal syndromes, and the rise of the angiosperms: evidence and hypothesis. Ann. Miss. Bot. Gard., 71: TRAVESET A., 1990 Ctenosaura similis Gray (Iguanidae) as a seed disperser in a Central American deciduous forest. Am. Midl. Nat., 123: Authors addresses. S. FICI, Dipartimento di Scienze Botaniche, Via Archirafi n. 38, I-90123, Palermo; ficis@unipa.it - F. LO VALVO, Via Luparello n. 8, I-90128, Palermo; kunctator@tin.it
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